#SB doesn't even do a better job than CF in giving credence to Supreme Leader claims

[randomnameless]

If I may,

There is a civil war in Adrestia, or at least an uprising, it's basically the plot of Silver Snow (without civilians... so is it really a Civil War?), a bunch of nobles rebel against Supreme Leader, side with a third party, and then return to Adrestia to get rid of her.

Now, as for Adrestia in itself proper...

Doylist wise : it's because the devs never gave a fuck about it, because the Empire is just designed as this old decadent thing Supreme Leader rules over to conquer Fodlan.

Watsonian wise : It's never explained, but Nopes highlights the issue pretty well about the former nobles siding with Supreme Leader... and some who don't.

Ludwig (Aegir sr) even wonders, in his last moments in SB, why were Leopold and Waldemar given the chance and opportunity to join her side in her Fodlan conquest, but he wasn't given the same opportunity, even if Leopold and Waldemar sided with him during the Insurrection to depose Ionius.

Hell Varley, who was close to Aegir (so close that they planned to marry their heirs!) was spared and still had a role to play in Supreme Leader's Adrestia, when Aegir was jailed/executed (just like Vestra Sr!).

Is it because of the experiments? And yet, in FE16, Supreme Leader accuses Aegir and his "gaggle" of nobles, which would of course include Leopold, Waldemar and Grégoire!

Why do Bergliez, Hevring and Varley get a pass and a chance to side with her, but Vestra and Aegir are put down?

The only difference from FE16 is Varley - he is put under House arrest in FE16 since there's no Southern church subplot - so with this in mind, I could have seen some subplot where Aegir Sr tries to raise an army, but for all of the reasons @fantasyinvader invader mentionned, it wouldn't have been successful.

Bear in mind Hubert also does his "Hubert quotes" threatening to target "loved ones" when a BE peep fights against him, so with this, Leopold being in charge of the army and being as corrupt and as much of a weatherwane as Acheron himself, civilians being conscripted/starving in Adrestia and Agarthans running free (+ whatever happens to make people turn into Crest Beasts) if there would be a civil war in Adrestia I'd just see it as some rebellion/guerilla thing, but to raise an army within Adrestia?

Mmh... Tough chance.

That's why the ones who want to "rebel" leave Adrestia to join someone else to fight against her, iirc, wasn't SS called in japan the "Empire route", aka, Adrestia's route?

Sure, it's Billy's route, but in the end, it's the one where Adrestians revolt and rebel against Supreme Leader, and are assisted by the Church.

@maelor321

There's an answer for that, and it ties into how Edelgard is supposed to be a tyrant.

Edelgard convinced Count Bergliez to join her, under the promise of awarding him control over the Alliance territories according to Flower. As Minister of Military Affairs, Caspapa is said to control all armies in the Empire that are not under the direct control of the Emperor and is said to be a man who inspires great loyalty in his troops. As such, the armies that the other nobles may have could turn on them when he says to join Edelgard. From what we know, Edelgard was able to bring the corrupt nobility of the Empire to heel (minus Caspapa) likely because of this, and from there arrested any who didn't support her, stripping them of their power, lands and titles while telling the rest they can keep theirs if they support her. And, of course, the commoners are conscripted to fight with those who resist put to death.

This is what the devs her path leading to hadou, the path of supremacy or military rule, means.

We also have Hubert doing Hubert things, having even people Edelgard says to spare assassinated in his supports. This continues on into his endings, where he's said to put down any threat to her from the shadows which the Englist team translated as him putting down rebellions post-war.

It's noted though that this isn't enough to maintain order over all of Fodlan. Edelgard pledges to continue to work with Thales post-war until things calm down, that conversation hinting at something that was actually downplayed in the translation. Post-war, according to Caspar's endings, the Imperial army begins military expeditions which means (since the military is very precise with it's wording) they are conducting missions in those countries. It's considered a form of invasion, and what's worse is that the Japanese doesn't say they are "sometimes reckless" like the English does. It's "often out of control." And circling back to TWSITD for a second, the Byleth/Constance ending reveals that they pilfer Agarthan magic techniques (aka blood Magic) and technologies during the shadow war and use it to maintain the "peace" of Edelgard's rule. Meanwhile, the Empire takes over the Church of Seiros, restoring it in such a manner that Mercedes refuses to join it (instead, she looks after those hurt by the war in defiance of Edelgard's ideals). And then there's the propaganda.

Edelgard's path isn't the hardest outside of ignoring the red flags. She just says it is.